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Keltner JL, Johnson CA, Spurr JO, Beck RW.Keltner JL, et al.Arch Ophthalmol. 1993 Feb;111(2):231-4. doi: 10.1001/archopht.1993.01090020085029.Arch Ophthalmol. 1993.PMID: 8431161
Keltner JL, Johnson CA, Spurr JO, Beck RW.Keltner JL, et al.Arch Ophthalmol. 1994 Jul;112(7):946-53. doi: 10.1001/archopht.1994.01090190094027.Arch Ophthalmol. 1994.PMID: 8031275Clinical Trial.